Diễn đàn hỗ trợ Firefox

For the last few months I have problems with Youtube or installing extensions. In both instances I get a message saying I have an outdated browser (version 2), and need to upgrade. I have installed Firefox 3 (Most recently 3.6.3) multiple times, closing the old version first every time. Firefox/about shows that I have 3.6.3 installed. I even tried deleting the old version entirely and downloading the new version with Safari (I saved my bookmarks, etc. in that case). Something is very wrong, and I'm unable to install several important extensions because of this problem.

I'm using a Mac, OSX 10.5.8.

I'm at my wits end. Does anyone have any suggestions?

This happened

Every time Firefox opened

== I installed version 3.

I have had Firefox 2.0 installed on my Mac Book 10.4 Tiger for a long time. Now I have to do an online course that requires Firefox 3.0 or newer. I cannot download 3.6 because it's not compatible. I get an error message. How do I find an older version than 3.6 to install?